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Hersteller: Cleveland Range Dateigröße: 3.93 mb Dateiname: Unterrichtssprache:

NO. aiss 3 UWTE «TEW*t *CSR VAVC HtfK FT. NO. 22223 FT. №1 2W78 ft. ^ -ZJ ORtti V*C€ FT. KQ. 22221 R _ A . R 4- opnm iKTERurnEKT euawm 1 r; cokhoc csasr CROWD BK —} WOSt l£V€L y PROSE ASST. FT. «0. 413S7 * IttVKER —j CUTOPFPROK W ASSQlSLT T FT. KQ.4WS8 KJCH IMT PRESSURE SWfTCH PT. NO. 199*7 CPSWtG FRESSU& SiriOi PT. NO. 19947 RScT swjch PT. NO. 1999* © © 3 © © SIEW SOiXXO COL PL «0. 22193 4- RSJCTCBL PT. wa 03524 i£L*r SOOCT ( KOT SHORN ) PT. no. C3S25 CRG£D m©OS - CORRESWO TO RQAT scan cowtnwc I fit fiEcrawc tffBWl ]5_i, mtSR j • "I 0 ‘ } PT. NO. 1&47I6 4- ntw w.i Ft. SO. 22221 OPTIONAL NTERunTENI BLOWDOWN STEM/ COIL CENERATOR CONTROL WRWG [ NTERlinTEKI BLOWDOWN OPTIONAL ) Sieam Coil Models US VAC 50- P0«R S*TTCH o PT. NO. 19993 SEE 3&0W FOR FROM CUSTOMER CONNECTION cr 3 UK^t WIDVAt *«S? Wi.V£ IBCK PT- ND. 22223 PT. NO. 20*78 BL SL OftW WIVE PT. NO. 22221 R ^ / ft 4- OPTOHAl angRtfTTHNT BtOKQOW COtf sc YA3ER LEVS. CONTROL PT. NO. 23196 0 —I 80t£R I GROUND 8K cocrx crmt tar 0PSU7WC PRESSURE Sima PT. *L 199*7 6 Y < © 4- -11 mWJtR l£va PROBE ASST, y PT. NO. 4t3S7 * LOW wH3t n cyroFTpRoee ASS&6LY ' PT. MO. «13SS RESET s*nw PT. №. @t9994 STEW SOt£NOC COB. PT. NO. 22193 w RSAT cot PT. NO. C3S2* © © © ,s BJ | Sp © RESET -& RELAT soacer ( NOT S0IN ) PT. NO. 0352$ CROED NUW8SRS - COfSSSPONO 10 REUT SXXTT CONNECTOS rTo=L 1 _U I RCCrajNC X KIERWL Rji I TIMER 1 ? PT. NO. 1Q471S iiG -V DRW VX.VE PT. NO. 22221 * (H№ WTERWTTENT &0W3OWN STEAM con generator control wiring SECONtMRT LOW WATER CUTOFF ( WftRMfiTEHT 810WDOTN OFTONM.) Steam Coi! Models with Secondary Low Water Cutoff WATER LEVEL CONTROL SYSTEM TROUBLESHOOTING AND REPAIR General Description of Operation: The Cleveland Range water level control, P/N 23198, is designed to maintain operating water level in Cleveland Range steam generators and to ensure that the heat source is only operated when the generator water level is above a specified minimum level. The sensing technique for the control relies on the fact that tap water is conductive to electricity; if two metal electrodes are immersed in a bath of water, electric current can flow between the electrodes using the water as a conductor. Water is not a good conductor, like copper, but is conductive enough to be measured using appropriate electronic circuitry. The Cleveland Range control is a two probe system having two metallic probes (LOW and HI) for sensing water in the generator? a COM terminal is placed on the tank. The LOW probe is placed so that it will come in contact with the water when the water level is just above the desired water level, enough to protect the heat source. If the water is of sufficient level and the LOW probe is in the water, a small electrical current provided by the level control electronics will flow between the probe and COM? this flow will be sensed by the electronics which in turn will activate the "HEAT" relay to apply AC power to the HEAT terminal on the control circuit board. Similarly, the HI probe is located at the desired water level fill (above the LOW probe level) so that when the water level has reached the desired fill level electrical current will flow between the HI probe and COM. The action of this probe is reversed from the previous situation so that when water reaches the HI probe, the WATER fill relay is deactivated so that AC power to the WF is turned off. When the water level drops below the HI probe, the WF terminal will be reenergized after a five second delay. The time delay is to prevent bubbling or turbulence in the generator from chattering to WATER fill relay or the water valve solenoid. The control runs on 120 vac and is transformer isolated so that the probes and the electronics are run at low voltage and are not common to the AC power line. Note that in many Cleveland Range generators both sensing probes are inserted from the front top of the unit down into the generator. In this case, the LOW probe will be the longest and the HI probe will be the shortest. Page 1 A) SYMPTOMS OF WATER LEVEL CONTROL RELATED PROBLEMS: 1) Boiler overfills or floods 2) Boiler dry fires (system underfills or doesn't fill) 3) Boiler doesn't fill at all 4) Water fill solenoid chatter 5) Heater contactor chatter 6) Fills but cuts out on LOW WATER before filling again 7) Overfills but does not heat 8) Fills but does not heat B) POSSIBLE CAUSES: 1) Inoperative water level control circuit board (P/N 23198) 2) Incorrect or damaged wiring to probes 3) Incorrect or damaged wiring from water level board to loads 4) Damaged probes 5) Probes shorted together 6) Scale build-up on probes C) FAULT ISOLATION PROCEDURE: Equipment Required: Volt/Ohmmeter (VOM) or Multimeter STEP TEST RESULT REMEDY 1. Is power applied to the con- Yes trol circuit board? Measure L1-L2 at the board to be 120 No VAC + 15V. 2. Remove two AC power wires Yes from control board and conne...

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